(19)
(11) EP 0 199 459 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.04.1988 Bulletin 1988/17

(43) Date of publication A2:
29.10.1986 Bulletin 1986/44

(21) Application number: 86302013

(22) Date of filing: 19.03.1986
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI NL SE

(30) Priority: 11.04.1985 US 722229
23.12.1985 US 812469

(71) Applicant: Corning Glass Works
 ()

(72) Inventor:
  • Ketcham, Thomas Dale
     ()

   


(54) High toughness ceramic alloys


(57) This invention is directed to the production of ceramic alloys consisting essentially of partially stabilized ZrO2 and/or ZrO2-HfO2 solid solution and/or HfO2 exhibiting high toughness through the inclusion of about 0.5-8 mole %, as expressed on the oxide basis, of YNb04 and/or YTaO4 and/or MNbO4 and/or MTaO,, wherein M represents Mg+2, Ca+2, Sc+3 and/or a rare earth metal ion selected from the group of La+3, Ce+4, Ce+3, Pr+3, Nd+3, Sm+3, Eu+3, Gd+3, Tb+3, DY+3, HO+3, Er+3, Tm+3, Yb+3, and Lu+3 substituted for Y, and the use of at least 5 volume percent of such ceramic alloys to toughen hard refractory ceramics.






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